Sorting by Importance and changing font size in the Firefox sid

I really like the Firefox Sidebar, but there are two things I'd like to do that I can't figure out:
How do you sort by importance, as you can with the hotlist on the website?
How do you change the font size? It's at least 18 point on my monitor and takes up way too much space.
Thanks!

(For what it's worth, the importance ranking is the feature that made me immediately drop all attempts to make other to-do list managers work; I've been implementing a similar system via Excel and VBS because I couldn't find any other place that did it. Your algorithm is genius, and more robust than mine.)